(a.) Not communicable; incapable of being communicated, shared, told, or imparted, to others.
Thesaurus Entries
inalienable, indefeasible, indefinable, indescribable, ineffable, inenarrable, inexpressible, innominable, noncommunicable, noncontagious, noninfectious, undefinable, unimpartable, unmentionable, unnameable, unspeakable, unutterable, unwhisperable
